A Grid Voltage Sensor-less Control Scheme for Single-Phase Integrated Battery Charger

As the global adoption of electric vehicles continues to rise, integrated battery chargers play a pivotal role in shaping the future of electric transportation. In this paper, a grid voltage sensorless control scheme for single-phase integrated battery charger is presented. In an integrated battery charger, the drive components, such as the motor and the inverter used for driving the EV, are reused for charging the battery. The windings of the three-phase induction motor are used as grid interface inductances between the grid and the inverter via a diode bridge rectifier. The interleaving technique is implemented to suppress the ripple in the current drawn from the grid. In the conventional control schemes for battery chargers, there is a need for grid voltage sensing in order to draw currents from the grid at the unity power factor. However, the proposed sensor-less scheme eliminates the need for sensing AC grid voltage to maintain a unity power factor. Hence, reducing the cost of the electric vehicle significantly by eliminating the need for a voltage sensor to sense the grid voltage. The proposed control scheme is simulated and validated for steady-state and transient conditions using MATLAB Simulink.